Kdesu has forgotten root password

[John O'Hagan <johnohagan@iprimus.com.au>]

Hi list,

This one has me stumped: in the middle of a session, kdesu stopped accepting 
my password, saying it was incorrect. So now I can't run adept, root Konsole 
or Konqueror etc, as easily as I'd like!

Normal su in a console works fine, kwallet accept the same password, other vts 
are OK with it as well. 

Caps and num locks are off.

Restarting KDE didn't work; nor did rebooting.

Where does kdesu look for passwords? Any ideas on how to fix this?

Thanks, 

John